I started out with two wild Mallard ducklings. This is what got me addicted to ducks. Then I ordered my two more females from Metzers. I asked for them to be pinioned so that they would not fly away but they forgot to do it. I had a wild duckling drake and a hen when I first started out. My one mallard hen is a lot smaller than my other one but still bigger than my two Call Drakes. I only have the two Call Drakes. They are both shorter and not as big as my Mallard hens that I have now. My one has given me many eggs and the one that I let hatch them out only gave me two Hens out of over 30 ducklings over the years. She just throws off drakes. My bigger Mallard hen has no interest in hatching out any eggs so I don't know what her male to female ration would be. They can fly very well though and the drakes that I have rehomed have all left their new owners, 4 of them left after being with the flock for over 2 years which shocked me.I assume that some of my ducks have some fresh Mallard genes in them. Brownie Drake was one of them and i am not sure about Walgreens and Laura…
As for drowning ducks: The Mallard drakes won't be able to drown my ducks as even the Indian Runner Girls are almost twice the size of a Mallard drake. And for the Mallard Ducks, they know how to shake off my drakes. These Ladies are fast and agile and so far it has always ended with the wild duck mounting the domestic drake and ripped out neck-feathers.
Do you have call-ducks? - That would be a different story, calls are the same size as the wild Mallards. I bet @shawluvsbirds can tell stories about her calls interactions with wild dux…